Doc here: In the Splintered lands these are the Everliving, a mostly-mortal culture in which mummies rule over ordinary humans and use them as well as their animated skeletons in battle. The humans serve faithfully in hopes of achieving the "immortality" of their masters.

Their primary opponents will be the Sons of Horus who are Godfearers (monotheists) somewhat modeled after the ancient Hebrews.

I expect there will eventually be some other Egyptian-themed units and cultures.